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Summary of Significant Accounting Policies - Investments in Affiliates and Other Entities (Details)
mile in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
mile
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Equity method investments $ 60,400   $ 60,400     $ 44,900
Equity in earnings (losses) of unconsolidated affiliates 8,108 $ (4,784) 13,976 $ (7,467)    
Investment in real estate 23,500   23,500      
Impairment of cost method investment 0 $ 9,311 0 9,311    
Length of electric transmission and distribution system | mile   18        
Quanta Services, Inc.            
Summary Of Significant Accounting Policies [Line Items]            
Cost method investments 129,300   129,300     39,500
LUMA Energy, LLC            
Summary Of Significant Accounting Policies [Line Items]            
Term of operation and maintenance agreement   15 years        
Integral Unconsolidated Affiliates            
Summary Of Significant Accounting Policies [Line Items]            
Due from related parties 11,600   11,600      
Due to related parties 4,300   4,300      
Certain Non-Integral Equity Investments            
Summary Of Significant Accounting Policies [Line Items]            
Equity in earnings (losses) of unconsolidated affiliates   $ (5,500)   $ (8,700)    
Communications Technology Company            
Summary Of Significant Accounting Policies [Line Items]            
Cost method investments         $ 90,000  
Cost Method Investment | Quanta Services, Inc.            
Summary Of Significant Accounting Policies [Line Items]            
Impairment of cost method investment   $ 9,300        
LUMA Energy, LLC            
Summary Of Significant Accounting Policies [Line Items]            
Equity method investments $ 25,000   $ 25,000     $ 10,900
Equity interest   50.00%   50.00%